1 # SPDX-License-Identifier: GPL-2.0-or-later
3 # A start sequence to change from cJTAG to 4-pin JTAG
4 # This is needed for CC2538 and CC26xx to be able to communicate through JTAG
5 # Read section 6.3 in http://www.ti.com/lit/pdf/swru319 for more information.
6 proc ti_cjtag_to_4pin_jtag {jrc} {
8 irscan $jrc 0x3f -endstate RUN/IDLE
9 # Two zero bit scans and a one bit drshift
10 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
11 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
12 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
13 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
14 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
15 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
16 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
18 # A two bit drhift and a 9 bit drshift
19 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRUPDATE RUN/IDLE
20 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
21 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
22 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
23 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
24 pathmove DRPAUSE DREXIT2 DRSHIFT DRSHIFT DREXIT1 DRPAUSE
25 pathmove DRPAUSE DREXIT2 DRSHIFT DREXIT1 DRPAUSE
26 pathmove DRPAUSE DREXIT2 DRUPDATE RUN/IDLE
27 pathmove RUN/IDLE DRSELECT DRCAPTURE DREXIT1 DRPAUSE
30 irscan $jrc 0x3f -endstate RUN/IDLE
32 # Set ICEPick IDCODE in data register
33 irscan $jrc 0x04 -endstate RUN/IDLE